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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2007 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.io;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import com.google.common.annotations.Beta;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import com.google.common.base.Preconditions;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import com.google.common.primitives.Longs;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.io.DataOutput;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.io.DataOutputStream;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.io.FilterOutputStream;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.io.IOException;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.io.OutputStream;<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span>/**<a name="line.29"></a>
<span class="sourceLineNo">030</span> * An implementation of {@link DataOutput} that uses little-endian byte ordering<a name="line.30"></a>
<span class="sourceLineNo">031</span> * for writing {@code char}, {@code short}, {@code int}, {@code float}, {@code<a name="line.31"></a>
<span class="sourceLineNo">032</span> * double}, and {@code long} values.<a name="line.32"></a>
<span class="sourceLineNo">033</span> * &lt;p&gt;<a name="line.33"></a>
<span class="sourceLineNo">034</span> * &lt;b&gt;Note:&lt;/b&gt; This class intentionally violates the specification of its<a name="line.34"></a>
<span class="sourceLineNo">035</span> * supertype {@code DataOutput}, which explicitly requires big-endian byte<a name="line.35"></a>
<span class="sourceLineNo">036</span> * order.<a name="line.36"></a>
<span class="sourceLineNo">037</span> *<a name="line.37"></a>
<span class="sourceLineNo">038</span> * @author Chris Nokleberg<a name="line.38"></a>
<span class="sourceLineNo">039</span> * @author Keith Bottner<a name="line.39"></a>
<span class="sourceLineNo">040</span> * @since 8.0<a name="line.40"></a>
<span class="sourceLineNo">041</span> */<a name="line.41"></a>
<span class="sourceLineNo">042</span>@Beta<a name="line.42"></a>
<span class="sourceLineNo">043</span>public class LittleEndianDataOutputStream extends FilterOutputStream<a name="line.43"></a>
<span class="sourceLineNo">044</span>    implements DataOutput {<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span>  /**<a name="line.46"></a>
<span class="sourceLineNo">047</span>   * Creates a {@code LittleEndianDataOutputStream} that wraps the given stream.<a name="line.47"></a>
<span class="sourceLineNo">048</span>   *<a name="line.48"></a>
<span class="sourceLineNo">049</span>   * @param out the stream to delegate to<a name="line.49"></a>
<span class="sourceLineNo">050</span>   */<a name="line.50"></a>
<span class="sourceLineNo">051</span>  public LittleEndianDataOutputStream(OutputStream out) {<a name="line.51"></a>
<span class="sourceLineNo">052</span>    super(new DataOutputStream(Preconditions.checkNotNull(out)));<a name="line.52"></a>
<span class="sourceLineNo">053</span>  }<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
<span class="sourceLineNo">055</span>  @Override public void write(byte[] b, int off, int len) throws IOException {<a name="line.55"></a>
<span class="sourceLineNo">056</span>    // Override slow FilterOutputStream impl<a name="line.56"></a>
<span class="sourceLineNo">057</span>    out.write(b, off, len);<a name="line.57"></a>
<span class="sourceLineNo">058</span>  }<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>
<span class="sourceLineNo">060</span>  @Override public void writeBoolean(boolean v) throws IOException {<a name="line.60"></a>
<span class="sourceLineNo">061</span>    ((DataOutputStream) out).writeBoolean(v);<a name="line.61"></a>
<span class="sourceLineNo">062</span>  }<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span>  @Override public void writeByte(int v) throws IOException {<a name="line.64"></a>
<span class="sourceLineNo">065</span>    ((DataOutputStream) out).writeByte(v);<a name="line.65"></a>
<span class="sourceLineNo">066</span>  }<a name="line.66"></a>
<span class="sourceLineNo">067</span><a name="line.67"></a>
<span class="sourceLineNo">068</span>  /**<a name="line.68"></a>
<span class="sourceLineNo">069</span>   * @deprecated The semantics of {@code writeBytes(String s)} are considered<a name="line.69"></a>
<span class="sourceLineNo">070</span>   *             dangerous. Please use {@link #writeUTF(String s)},<a name="line.70"></a>
<span class="sourceLineNo">071</span>   *             {@link #writeChars(String s)} or another write method instead.<a name="line.71"></a>
<span class="sourceLineNo">072</span>   */<a name="line.72"></a>
<span class="sourceLineNo">073</span>  @Deprecated<a name="line.73"></a>
<span class="sourceLineNo">074</span>  @Override public void writeBytes(String s) throws IOException {<a name="line.74"></a>
<span class="sourceLineNo">075</span>    ((DataOutputStream) out).writeBytes(s);<a name="line.75"></a>
<span class="sourceLineNo">076</span>  }<a name="line.76"></a>
<span class="sourceLineNo">077</span><a name="line.77"></a>
<span class="sourceLineNo">078</span>  /**<a name="line.78"></a>
<span class="sourceLineNo">079</span>   * Writes a char as specified by {@link DataOutputStream#writeChar(int)},<a name="line.79"></a>
<span class="sourceLineNo">080</span>   * except using little-endian byte order.<a name="line.80"></a>
<span class="sourceLineNo">081</span>   *<a name="line.81"></a>
<span class="sourceLineNo">082</span>   * @throws IOException if an I/O error occurs<a name="line.82"></a>
<span class="sourceLineNo">083</span>   */<a name="line.83"></a>
<span class="sourceLineNo">084</span>  @Override public void writeChar(int v) throws IOException {<a name="line.84"></a>
<span class="sourceLineNo">085</span>    writeShort(v);<a name="line.85"></a>
<span class="sourceLineNo">086</span>  }<a name="line.86"></a>
<span class="sourceLineNo">087</span><a name="line.87"></a>
<span class="sourceLineNo">088</span>  /**<a name="line.88"></a>
<span class="sourceLineNo">089</span>   * Writes a {@code String} as specified by<a name="line.89"></a>
<span class="sourceLineNo">090</span>   * {@link DataOutputStream#writeChars(String)}, except each character is<a name="line.90"></a>
<span class="sourceLineNo">091</span>   * written using little-endian byte order.<a name="line.91"></a>
<span class="sourceLineNo">092</span>   *<a name="line.92"></a>
<span class="sourceLineNo">093</span>   * @throws IOException if an I/O error occurs<a name="line.93"></a>
<span class="sourceLineNo">094</span>   */<a name="line.94"></a>
<span class="sourceLineNo">095</span>  @Override public void writeChars(String s) throws IOException {<a name="line.95"></a>
<span class="sourceLineNo">096</span>    for (int i = 0; i &lt; s.length(); i++) {<a name="line.96"></a>
<span class="sourceLineNo">097</span>      writeChar(s.charAt(i));<a name="line.97"></a>
<span class="sourceLineNo">098</span>    }<a name="line.98"></a>
<span class="sourceLineNo">099</span>  }<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>
<span class="sourceLineNo">101</span>  /**<a name="line.101"></a>
<span class="sourceLineNo">102</span>   * Writes a {@code double} as specified by<a name="line.102"></a>
<span class="sourceLineNo">103</span>   * {@link DataOutputStream#writeDouble(double)}, except using little-endian<a name="line.103"></a>
<span class="sourceLineNo">104</span>   * byte order.<a name="line.104"></a>
<span class="sourceLineNo">105</span>   *<a name="line.105"></a>
<span class="sourceLineNo">106</span>   * @throws IOException if an I/O error occurs<a name="line.106"></a>
<span class="sourceLineNo">107</span>   */<a name="line.107"></a>
<span class="sourceLineNo">108</span>  @Override public void writeDouble(double v) throws IOException {<a name="line.108"></a>
<span class="sourceLineNo">109</span>    writeLong(Double.doubleToLongBits(v));<a name="line.109"></a>
<span class="sourceLineNo">110</span>  }<a name="line.110"></a>
<span class="sourceLineNo">111</span><a name="line.111"></a>
<span class="sourceLineNo">112</span>  /**<a name="line.112"></a>
<span class="sourceLineNo">113</span>   * Writes a {@code float} as specified by<a name="line.113"></a>
<span class="sourceLineNo">114</span>   * {@link DataOutputStream#writeFloat(float)}, except using little-endian byte<a name="line.114"></a>
<span class="sourceLineNo">115</span>   * order.<a name="line.115"></a>
<span class="sourceLineNo">116</span>   *<a name="line.116"></a>
<span class="sourceLineNo">117</span>   * @throws IOException if an I/O error occurs<a name="line.117"></a>
<span class="sourceLineNo">118</span>   */<a name="line.118"></a>
<span class="sourceLineNo">119</span>  @Override public void writeFloat(float v) throws IOException {<a name="line.119"></a>
<span class="sourceLineNo">120</span>    writeInt(Float.floatToIntBits(v));<a name="line.120"></a>
<span class="sourceLineNo">121</span>  }<a name="line.121"></a>
<span class="sourceLineNo">122</span><a name="line.122"></a>
<span class="sourceLineNo">123</span>  /**<a name="line.123"></a>
<span class="sourceLineNo">124</span>   * Writes an {@code int} as specified by<a name="line.124"></a>
<span class="sourceLineNo">125</span>   * {@link DataOutputStream#writeInt(int)}, except using little-endian byte<a name="line.125"></a>
<span class="sourceLineNo">126</span>   * order.<a name="line.126"></a>
<span class="sourceLineNo">127</span>   *<a name="line.127"></a>
<span class="sourceLineNo">128</span>   * @throws IOException if an I/O error occurs<a name="line.128"></a>
<span class="sourceLineNo">129</span>   */<a name="line.129"></a>
<span class="sourceLineNo">130</span>  @Override public void writeInt(int v) throws IOException {<a name="line.130"></a>
<span class="sourceLineNo">131</span>    out.write(0xFF &amp; v);<a name="line.131"></a>
<span class="sourceLineNo">132</span>    out.write(0xFF &amp; (v &gt;&gt; 8));<a name="line.132"></a>
<span class="sourceLineNo">133</span>    out.write(0xFF &amp; (v &gt;&gt; 16));<a name="line.133"></a>
<span class="sourceLineNo">134</span>    out.write(0xFF &amp; (v &gt;&gt; 24));<a name="line.134"></a>
<span class="sourceLineNo">135</span>  }<a name="line.135"></a>
<span class="sourceLineNo">136</span><a name="line.136"></a>
<span class="sourceLineNo">137</span>  /**<a name="line.137"></a>
<span class="sourceLineNo">138</span>   * Writes a {@code long} as specified by<a name="line.138"></a>
<span class="sourceLineNo">139</span>   * {@link DataOutputStream#writeLong(long)}, except using little-endian byte<a name="line.139"></a>
<span class="sourceLineNo">140</span>   * order.<a name="line.140"></a>
<span class="sourceLineNo">141</span>   *<a name="line.141"></a>
<span class="sourceLineNo">142</span>   * @throws IOException if an I/O error occurs<a name="line.142"></a>
<span class="sourceLineNo">143</span>   */<a name="line.143"></a>
<span class="sourceLineNo">144</span>  @Override public void writeLong(long v) throws IOException {<a name="line.144"></a>
<span class="sourceLineNo">145</span>    byte[] bytes = Longs.toByteArray(Long.reverseBytes(v));<a name="line.145"></a>
<span class="sourceLineNo">146</span>    write(bytes, 0, bytes.length);<a name="line.146"></a>
<span class="sourceLineNo">147</span>  }<a name="line.147"></a>
<span class="sourceLineNo">148</span><a name="line.148"></a>
<span class="sourceLineNo">149</span>  /**<a name="line.149"></a>
<span class="sourceLineNo">150</span>   * Writes a {@code short} as specified by<a name="line.150"></a>
<span class="sourceLineNo">151</span>   * {@link DataOutputStream#writeShort(int)}, except using little-endian byte<a name="line.151"></a>
<span class="sourceLineNo">152</span>   * order.<a name="line.152"></a>
<span class="sourceLineNo">153</span>   *<a name="line.153"></a>
<span class="sourceLineNo">154</span>   * @throws IOException if an I/O error occurs<a name="line.154"></a>
<span class="sourceLineNo">155</span>   */<a name="line.155"></a>
<span class="sourceLineNo">156</span>  @Override public void writeShort(int v) throws IOException {<a name="line.156"></a>
<span class="sourceLineNo">157</span>    out.write(0xFF &amp; v);<a name="line.157"></a>
<span class="sourceLineNo">158</span>    out.write(0xFF &amp; (v &gt;&gt; 8));<a name="line.158"></a>
<span class="sourceLineNo">159</span>  }<a name="line.159"></a>
<span class="sourceLineNo">160</span><a name="line.160"></a>
<span class="sourceLineNo">161</span>  @Override public void writeUTF(String str) throws IOException {<a name="line.161"></a>
<span class="sourceLineNo">162</span>    ((DataOutputStream) out).writeUTF(str);<a name="line.162"></a>
<span class="sourceLineNo">163</span>  }<a name="line.163"></a>
<span class="sourceLineNo">164</span>}<a name="line.164"></a>




























































</pre>
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